Dateline with Lester Holt
THURS. 10P/9C, FRI. 9P/8C AND SUN. 7P/6C

PREVIEW: Obsession in the Lone Star State

A beloved doctor is found brutally murdered in his Texas home. As police investigate the crime, an unexpected tip reveals a sinister tale of obsession, revenge and unrequited love. Andrea Canning reports.